Do I need a business license to run a hard pen calligraphy training class?

running a class means business, and business means business. Business means income, and income must be clear. Clear means legal business, and legal business requires a business license. The way to do this is to start training and get a business license, which is what everyone does. However, there are also those who don't take photos. To be bigger, to be longer, or to take photos.